Researchers believe that the cardinal frequenting the Caldwells’ bird feeder in Erie, Pennsylvania, is a rare bilateral gynandromorph, half male and half female. Not much is known about the unusual ...

But bird tool use goes far beyond corvids. For instance, green herons use twigs, feathers, insects, or even bread to bait fish. The heron tosses its chosen lure onto the surface of a pond and, as soon ...

On an otherwise unremarkable day in 2023, Jason Love and his colleagues were gathering in a parking lot when they saw something that, as far as we know, no one had ever seen before. Love, the ...